Method for preparing organosilicium compounds in two-phase...

Details Method for preparing organosilicium compounds in two-phase... Method for preparing organosilicium compounds in two-phase...

C - Chemistry, Metallurgy

07

F

C07F 7/18 (2006.01)

Patent

CA 2609311

The invention concerns the synthesis of functionalized organosilicium compounds comprising at least an activated azo group, of formula (I): [(G0)3SiO1/2]m [(G0)2SiO2/2]n [G0SiO3/2]o [SiO4/2]p [(G2)a(G1)a'(Z-CO-HN=NH-CO-A)SiO(3-a-a')/2 ] (I). Said method consists in using at least one hydrazino precursor (II) (-HN-NH-) of the compound (I), oxidizing the precursor (II) into an azo group for the compound (I), using an oxidizing system comprising at least one oxidizing agent (Ox) and at least one base (B). Said method is characterized in that the oxidizing is carried out in two-phase aqueous/organic medium and such that the pH of the aqueous phase is between 3 and 11, preferably between 5 and 9. The invention also concerns the thermally stable compounds obtainable by said method.

Le domaine de l'invention est celui de la synthèse de composés organosiliciques fonctionnalisés comprenant au moins un groupe azo activé, de formule (I) : [(G0)3SiO1/2]m [(G0)2SiO2/2]n [G0SiO3/2]o [SiO4/2]p [(G2)a(G1)a'(Z-CO-HN=NH-CO-A)SiO(3-a-a')/2]. Ce procédé consiste à mettre en AEuvre au moins un précurseur (II) hydrazino (-HN-NH-) du composé (I), à oxyder le précurseur (II) en groupement azo propre au composé (I), à l'aide d'un système oxydant comprenant au moins un oxydant (Ox) et au moins une base (B), ce procédé étant caractérisé en ce que l'oxydation est réalisée en milieu biphasique aqueux/organique et en ce que l'on fait en sorte que le pH de la phase aqueuse soit compris entre 3 et 11, de préférence entre 5 et 9. L'invention concerne également les composés (I) stables à la chaleur susceptibles d'être obtenus par ce procédé.

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